** Description changed:

  In focal release of Ubuntu proper (GNOME Desktop) i was going trought the 
release on livestream using KVM based VM(libvirtd and virt-manager using 
default video settings provided by virt-manager, Host is ubuntu mate 20.04) and 
one of the things i was trying to show was fractional scaling which made my X11 
session unusable. Screen turned black. Tryed different settings in Virt-manager 
for Video non worked.
  Resolved the issue by switching to wayland session within which fractional 
scaling worked and i could disable it/switch to 100%.
  When i after that switched to X11 session scaling was back to normal.
  
  SideNote: when switching scaling in a VM i was running resolution was
  reseting back to normal.
  
+ https://youtu.be/0EFEGafZXDE?t=3400 link to the recording of a
+ livestream on youtube with timecode enabled. (Video name: checking out
+ Ubuntu 20.04 LTS, Channel: bigpod, timecode: 56:40)
  
- https://youtu.be/0EFEGafZXDE?t=3400 link to the recording of a livestream on 
youtube with timecode enabled. (Video name: checking out Ubuntu 20.04 LTS, 
Channel: bigpod, timecode: 56:40)
+ 
+ Edit: Additinal information, Can confirm this happening on stock ubuntu 
installed on my system on top of ubuntu mate 20.04 . Setting selected 150%
+ 1920x1080 resolution. additionaly it appears that it only affects single 
monitor setups becasue this didnt happen on dual monitor system until i set 
gnome to mirror on both displays.

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https://bugs.launchpad.net/bugs/1876508

Title:
  Fractional scaling crashes X11 session in KVM based virtual machines

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